Langan, J. (2004). Sentence skills: A workbook for writers : form B (7th ed.). Boston: McGraw-Hill.
Παραπομπή Chicago StyleLangan, John. Sentence Skills: A Workbook for Writers : Form B. 7th ed. Boston: McGraw-Hill, 2004.
Παραπομπή MLALangan, John. Sentence Skills: A Workbook for Writers : Form B. 7th ed. Boston: McGraw-Hill, 2004.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.